//index.js  
//获取应用实例 
Page( {  
  data: {  
    //  页面配置
    winWidth: 0,
    winHeight: 0,
    // tab切换
    currentTab: 0,
  },  
  onLoad: function() {  
    var that = this;
    // 获取系统信息 
    wx.getSystemInfo( {
      success: function( res ) {
        that.setData( {
          winWidth: res.windowWidth,
          winHeight: res.windowHeight
        });
      }
    });  
  },  
  // 滑动切换tab 
  bindChange: function( e:any ) {
    var that = this;
    that.setData( { currentTab: e.detail.current });
  },
  // 点击tab切换 
  swichNav: function( e:any ) {
    var that = this;
    if( this.data.currentTab === e.target.dataset.current ) {
      return false;
    } else {
      that.setData( {
        currentTab: e.target.dataset.current
      })
    } return true;
  }
})